n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 18 |
5 | 66 |
6 | 396 |
7 | 2052 |
8 | 12636 |
9 | 91548 |
10 | 625176 |
11 | 4673736 |
12 | 43575192 |
13 | 377205336 |
14 | 3624289488 |
15 | 38829340656 |
16 | 397695226896 |
17 | 4338579616272 |
18 | 54018173703456 |
19 | 641634784488288 |
20 | 8208962893594656 |
21 | 113809776294348576 |
22 | 1526808627197721792 |
23 | 21533423236302943296 |
[1,1,2,6,18,66,396,2052,12636,91548,625176, 4673736,43575192,377205336,3624289488,38829340656, 397695226896,4338579616272,54018173703456, 641634784488288,8208962893594656, 113809776294348576,1526808627197721792, 21533423236302943296] |